Edwin medden



E. MEDDEN.

SAFETY VALVE.

(No Model.)

,450.5 .Patented Dec. 18, 1883.

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" i ve 71,270?l NITED STATES PATENT Finca.

EDVIN MEDDEN, OF SENECA FALLS, NEW YORK, ASSIGNOR TO THE SILSBYMANUFACTURING COMPANY, OF SAME PLACE.

SAFETY-VA I VE.

SPECIFICATION forming part of Letters Patent No. 290,450, dated December18, 1883.

Application filed August 20, 1883.

'o all whom it may concern,.-

Be it known that I, EDWIN MEDDEN, a citizen of the United States,residing at Seneca Falls, in the county of Seneca and State of New York,have invented certain new and useful Improvements in'Safety-Valve's, ofwhichA the following is a specication.

My invention relates to that class of safetyvalves in which a spring isemployed to hold the valve to its seat, said valves having means foradjusting the pressure of the spring, so as to adapt it to offer anydesired resistance, and also means for throwing them open for thepurpose of emptying the boiler of steam or air or admitting air to it.

My invention consists in providing such valves with means forcontrolling the device for throwing them open, whereby they may beopened and automatically held for any desired length of time.

The accompanying drawing is a vertical section of a valve with myinvention applied.

A represents the valve-cylinder, containing a valve of any ordinaryconstruction, which is held to its seat by a coil-spring, B, pressingdownward against an annular metallic disk,K, having a downwardly-projecting pintle or stud, la, which rests in a socket in the top of thevalve. The upper end of the spring B presses upwardly against a similarannular disk, b,

whose vupper face is provided with an annular socket, in which works thelower end of a hollow externallyscrew-threaded thimble, C, whose threadsengage with corresponding threads formed on the interior of a hub, a,supported centrally within the top of the valve-cylinder by means ofradial arms.

k is the upper end of the spindle, which is vformed integrally with orattached to the annular disk K, and passes upward centrally through thespring B and thimble C. Its upper end is screw-threaded, and carries apair of jam-nuts, Jj.

I is a nut keyed to the top of the thimble C, and provided with a lug,i', to which is pivoted a bent lever, D, whose upper end is bifurcatedor notched for the reception of the spindle k.

E is a collar surrounding the valve-cylinder, and provided on one sidewith a yoke, e, in

which works the lower end of the lever D,

(No model.)

said ring being fitted loosely and adapted to turn with the lever. Theouter extremity of the yoke e is provided with a screw-threaded socketfor the reception of an adj usting-screw, F, whose head f is providedwith an eye, through which works the neck g of the handle G, which is ofdumb-bell form.

H is a jam-nut working on the thimble C.

7a is the valve-stem, guided in a socketed hub supported from thevalve-case by radial arms.

rlhe operation of the device is as follows: rIhe thimble C is rstadjusted in such position as to adapt the spring B to exert the desiredmaximum pressure, and the jam-nut H brought down upon the top of thehub, a for preventing the thimble from being driven farther in,

The jam-nut j is then brought down, so as to bear lightly upon the topof the lever D, and the nut J brought down to hold it. The device isthenin condition for use. When it is desired to open the valve for thepurpose of emptying the boiler of steam or air, or admitting'air to it,the screw F is driven in, thus depressing the lever D and raising thespindle k and its accessories. The weighted ends G of the handle preventa retrograde movement of the screw F, which may bev due to the jar orvibrations of the engine when the device is used on nre-engines, forexample.

Having thus described my invention, the following is what I claim as newtherein and desire to secure by Letters Patent:

1. In a safety-valve, the combination, with a spring adapted to ,bearthe valve to its seat with yielding pressure, of a lever arranged topress back the spring, so as to releasethe valve when required, and ascrew for operating said lever, substantially as described.

2. The combination, with the spindle, of a valve having means forbearing such valve to its seat with yielding pressure, the pivoted' IOOjnsting-sorew F, for relieving said valve (by raising the spring) at anypoint below the pressure set, as set forth.

4. In combination with the lever and screw 5 for operating the valve, asliding handle for such screw, of dumb-bell form, for the purpose setforth.

5. The combination, with the spring of a. valve and a lever foroperating the said spring, of a ring surrounding the valve-eylin- 1oder, and provided With a yoke, in which an adjusting-sorer for operatingsaid lever has its bearings, substantially as and for the purpose setforth.

EDVIN MEDDEN.

Vitnesses:

JOHN A. SMITH, LEROY I. EMERY.

